{
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      "total": 1
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      "total": 7
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  "internally_reviewed": false,
  "review_kind": null,
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    "scope": [
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      "limitations",
      "sources",
      "tests"
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    "note": "Domain expert review is optional under CVP (CVP-EXP-01). Absence does not block CVP Verified. See Review policy for supplemental domain assurance."
  },
  "internal_review": {
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    "reviewer": null
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  "schema_output": "https://www.calculatorx.com/schemas/engineering.uncertainty.tur.output.json",
  "assumptions": [
    "ANSI/NCSL Z540.3 two-sided TUR = (USL−LSL)/(2U)",
    "U is already expanded; this page does not compute U = k·u_c",
    "tol is a half-width (span = 2·tol)",
    "Not a pass/fail, not a guard band, and not combined RSS"
  ],
  "limitations": [
    "U is already expanded — this page does not compute U = k·u_c",
    "Does not combine a measurement model or RSS of u_i",
    "Does not issue a TUR≥4 pass/fail or an ILAC G8 decision",
    "Not a guard band and not Cp/Cpk"
  ],
  "boundary_conditions": [
    "missing U or missing spec → MISSING_REQUIRED_INPUT",
    "U ≤ 0 or T ≤ 0 or tol ≤ 0 → VALUE_MUST_BE_POSITIVE",
    "usl ≤ lsl or more than one spec form → INVALID_INPUT"
  ],
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      "title": "ANSI/NCSL Z540.3 — Requirements for the Calibration of Measuring and Test Equipment",
      "section": "Test uncertainty ratio (two-sided TUR = specification span / 2U)",
      "supports": "TUR = (USL−LSL)/(2U) for a two-sided specification and an already-expanded U",
      "kind": "standard"
    },
    {
      "title": "ILAC G8:09/2019 — Guidelines on Decision Rules and Statements of Conformity",
      "section": "Decision rules are a different contract from TUR",
      "url": "https://ilac.org/publications-and-resources/ilac-guidance-series/",
      "supports": "This page does not implement ILAC G8 guarded acceptance or a pass/fail",
      "kind": "standard"
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      "golden": 1,
      "boundary": 7,
      "property": 4
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  "evidence_core_generated_at": "2026-09-23T10:39:08.821Z",
  "rendered_at": "2026-11-10T05:18:41.786Z",
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